function new_img = draw_on_img(img,points)
new_img = img;
[N D] = size(points);
for i = 1:N
    UV = points(i,:);    
    for r = UV(1)-1:UV(1)+1
        for c = UV(2)-1:UV(2)+1
            new_img(c,r) = 0;
        end
    end
end
end